## Multiplicity dependence of (multi-)strange hadron production in proton-proton collisions at $\sqrt{s} = 13$ TeV

### S. Acharya , Daniel Dąbrowski , Kamil Deja , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Piotr Nowakowski , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , M. O. Schmidt , Tomasz Trzciński , Hanna Zbroszczyk

#### Abstract

The production rates and the transverse momentum distribution of strange hadrons at mid-rapidity (|y|<0.5) are measured in proton-proton collisions at s√ = 13 TeV as a function of the charged particle multiplicity, using the ALICE detector at the LHC. It is found that the production rates of K0S, $\Lambda$, Ξ, and Ω increase with the multiplicity faster than what is reported for inclusive charged particles. The increase is found to be more pronounced for hadrons with a larger strangeness content. Possible auto-correlations between the charged particles and the strange hadrons are evaluated by measuring the event-activity with charged particle multiplicity estimators covering different pseudorapidity regions. The yields of strange hadrons are found to depend only on the mid-rapidity multiplicity for charged particle multiplicity estimators selecting in the forward region, which turn out to be more directly related to the number of Multiple Parton Interactions. Several features of the data are reproduced qualitatively by general purpose QCD Monte Carlo models that take into account the effect of densely-packed QCD strings in high multiplicity collisions. However, none of the tested models reproduce the data quantitatively. This work corroborates and extends the ALICE findings on strangeness production in proton-proton collisions at 7 TeV.
 Collective author The ALICE Collaboration Author S. Acharya S. Acharya,, - , Daniel Dąbrowski (FP / NPD) Daniel Dąbrowski,, - Nuclear Physics Division , Kamil Deja (FEIT / ICS) Kamil Deja,, - The Institute of Computer Science , Łukasz Graczykowski (FP / NPD) Łukasz Graczykowski,, - Nuclear Physics Division , Monika Jakubowska (FoEE / ICIE) Monika Jakubowska,, - The Institute of Control and Industrial Electronics , Małgorzata Janik (FP / NPD) Małgorzata Janik,, - Nuclear Physics Division , Adam Kisiel (FP / NPD) Adam Kisiel,, - Nuclear Physics Division , Julian Myrcha (FEIT / IN) Julian Myrcha,, - The Institute of Computer Science , Piotr Nowakowski (FEIT / ICS) Piotr Nowakowski,, - The Institute of Computer Science , Janusz Oleniacz (FP / NPD) Janusz Oleniacz,, - Nuclear Physics Division et al.` Total number of authors 1034 Journal series European Physical Journal C, ISSN 1434-6044, e-ISSN 1434-6052 Issue year 2020 No 80 Pages 1-26 Publication size in sheets 0.9 Article number 167 Keywords in English QCD ; relativistic heavy ion physics ; particle and resonance production ; experimental results ASJC Classification 3106 Nuclear and High Energy Physics DOI DOI:10.1140/epjc/s10052-020-7673-8 URL https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-020-7673-8 Language en angielski Score (nominal) 140 Score source journalList Score Ministerial score = 140.0, 10-06-2020, ArticleFromJournal Publication indicators WoS Citations = 0; Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.308; WoS Impact Factor: 2017 = 5.172 (2) - 2017=4.545 (5) Citation count*
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